Sorry about my first post. It is hard not to think that a coach is worth big bucks.
Value is hard to nail down. The Vintageairstream sight is a good place to start. Condition has a lot to due with value. Also, where you are will have some impact on value.
Manuals still can be purchased through Secretarial Services. (937) 492-8885
A manual will run you some where around $40.00 shipped to your house. I like the "reproduction" manual better than the original one I found later. The reproduction one is bigger and easier to read. The manual will answer a lot of your questions and give you a few more.
Hope this helped better